Sewage was flooding some homes in South Seattle early Monday, KIRO 7 Eyewitness News reported.
The sewage entered basements in at least five homes near South Willow Street and 40th Avenue South.
One man said he had about $25,000 in damage.
Sound Transit officials working on the light rail line on Martin Luther King Way said heavy rain overwhelmed a pump.
They said a contractor is getting a second pump online to help with the water backup.
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